Reinforced-concrete floor.



G. M. GRAHAM. REINFORCED CONCRETE FLO 0R. APPLICATION IiLED APB.21, 1909.

Patented Nov. 1, 1910.

2 SHEETS-SHEET 1.

G. M. GRAHAM. REINFORCED CONCRETE FLOOR.

AP'PLIOATION FILED APB-.21, 1909.

Patented NOV. 1, 1910.

2 SHEETS-SHEET 2,

a citizen of the United UNITED STAllES PATEN OFFICE;

GEORGE M, GRAHAM, OF CHICAGO, ILLINOIS,

ASSIGNOR, BY MESNE ASSIGNMENTS, TO

SUSPENSION STEEL CONCRETE COMPANY, A CORPORATION OF DELAWARE.

REINFORCED-CONCRETE FLOOR.

Application filed April 21, 1909. Serial No. 491,347.

Specification of Letters Patent.

.lateuted Nov. 1,119),

To o/t whom it may concern:

lle it known that I, Guouon M. GRAHAM,- vStates of An'ierica, and a resident of (Jhicago, in the county of (look and State of Illinois, have invented certain new and useful lmyu'ovements in Re iiiiorced-Concrete Floors, of which the following is a specification,

This invention relates to that class of reintorced concrete structures described in de tail in my prior Letters Patent No. 865,490, dated September 10, 1907, and has for its object to provide. a. simple and eilicient the cone-r method of formingthe floors and other horizontal portions of a reinforced concrete structure and by means of which checking and cracking due to irregular, internal strains is prevented, all as will hereinafter more fully appear.

In the accompanying drawings :-Figures 1, 2 and I} are plan views illustratlng the initial, intermediate and final steps of the present method of forming a multiple unit reinforced concrete iloor. Figs. 4, 5 and (i are correspomling longitudinal sections of the same.

Similar numerals of reference indicate like parts in the diil'erent views.

As represented in the drawings the supporting! frame and skeleton wire center for iloor or like horizontal. portion of a building or structure will he of the special construction described and claimed in my companion application, h'crial Nun'n her 491,34 eomyn'ise a constriwtion follows 1 represents the vertical posts; 2 the horizontal round border beams; 3 the horizontal round intermediate beams, secured together by suitable coupling pieces to constitute a n'iultiplieity of frame units or panels of a, uniform size and "varyin number in accordance with the horizonta area of the structure.

4 are windings of wire arranged in crossed relation shown, and made continuous the entire length well as width of the floor in order to encompass the entire series of iloor 'units or panels above referred to. Said windings are etl'ected under ordinary tienslon and the strands comprising the lower Web of the skeleton center formed by such windings will have an initial sag which is taken up and in turn assumed by the strands comt), tiled April 2t, 1909, and will:

ter, when the concrete mass is applied there to, in the manner hereinafter described, to form the fioor proper.

The present improvement involves a method of applying the concrete mass in a convenient manner, and with which the sa in the strands of the lower web of the skeleton center aforesaid is very etl'ectively taken upand. in turn assumed by the strands of the upper web of the skeleton center, and in an even manner which prevents the subsequent checking or seaming of the concrete mass in the complete setting of the same.

To such end the present improvement consists in the following serial steps: First, the

application of the concrete mass to the borhorder portions of the outer units or panels aforesaid, and fourth, with the setting of said horder masses, the, application of the concrete mass to tlu ccntral portions of the aforesaid outer units or panels, to complete the floor fol'mation. lVith such method of application a uniform dish is attained in the portions of the windings of wire individual to each unit or panel aforesaid, ml in cousequence a maximum and uniform strength throughout is attained, and with an avoidance of the tei'idency to checking and seamlug usual in large surfaces of concrete when formed as a whole.

ith the completion of the floor as above set forth, a mass of concrete is applied to the under web of the skeleton center in any usual and suitable manner.

Having thus fully described my said inyenti'onwhat l.clnim as new and desire to secure by Letters lateui, i

1. The hereinafter dc: rihed method of forming reinforced concrete floors in which the reinforce formed by wires woven around a multiple unit frame of round tuhing, such method comprising the application of the floor forming con rete mass tothe border portions of the central units, the application of the mass to the central portions of said central units, the application o1 the mass to the horde]- portions of the outer units, and tlw application of the mass to thc central portions of border units, such a plieations 'being successive and following t e setting of the preceding application, substantiully as set forth.

2. The herein described method of formapplication of the mass to the border portions-of the outer units, and the application of the mass to the central'portions of border units, such applications being successive and 5 reinforced concrete floors in which the following the setting of the receding applirelnforce is formed by wires wound in crossed relation around a multiple unit frame of round tubing, such method comprising the application of the .fioor forming cation, substantially as set orth.

Signed at Chicago, Illinois this 12th day of April 1909.

' GEORGE M. GRAHAM.

10 concrete mass to the border portions of the \Vitnesses: i central units, the application of the mass to ROBERT BURNS, the central portionsof said central units, the L. I'IOLDEN. 

